Process for the preparation of 2-alkyl cyclopent-2- enones

Details Process for the preparation of 2-alkyl cyclopent-2- enones Process for the preparation of 2-alkyl cyclopent-2- enones

C - Chemistry, Metallurgy

07

C

260/583.5, 260/4

C07C 49/597 (2006.01) C07C 45/59 (2006.01) C07C 49/687 (2006.01) C07C 49/753 (2006.01) C07C 69/738 (2006.01) C07D 303/42 (2006.01) C07D 307/33 (2006.01) C07D 315/00 (2006.01)

Patent

CA 1271488

Abstract of the Disclosure A process for the preparation of 2-alkyl cyclopent-2- enones having the formula: Image wherein R is as defined hereinafter. An .alpha.-olefin having the formula CH2 = CH - CH2R is oxidized to the corresponding epoxide. The epoxide is reacted with an alkylating agent having the form- ula Na+ [CH(COOR")2] - , wherein R" is an ethyl, an isopropyl, or an isobutyl radical An .alpha.-carbalkoxy-y-alkyl lactone is ob- tained, which, through saponification and decarboxylation, yields a y-alkyl lactone having the formula: Image which is reacted with a protic acid, thereby obtaining, by cycli- zation, the desired 2-alkylcyclopent-2-enone. The obtained pro- ducts are intermediates for the production of pharmaceutical products and of drugs for veterinary use, in particular prostag- landin.

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